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| Q. |
Which of the following is not preferred for electrode making? |
| A. | Ag-AgCl |
| B. | Copper |
| C. | Stainless-steel |
| D. | Gold |
| Answer» C. Stainless-steel | |
| Explanation: Stainless steel in contact with a saline electrolyte produce a potential difference of 10 mV between the electrodes which is much more than the limit (i.e 2.5 mV). Ad-AgCl electrodes give almost noise free characteristics. They are also found to be acceptable from the point of view of long term drift. | |
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